Docker/Containerisation is open source software with a free to use license? If this was restricted on Mac and Windows it would just add another reason to avoid

Docker/Containerisation is open source software with a free to use license? If this was restricted on Mac and Windows it would just add another reason to avoid these for infrastructure use. Avoiding OSX for this is already a no-brainer, given the lack of cloud availability and otherwise pricing, but at least if you're stuck with that, you can learn the tools for free. More or less the same for Windows, although there you at least have some cloud offerings.